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A peak that looks taller on a new screenshot may not represent a stronger reflection. Radar echo curve comparison starts with the distance axis, amplitude scale and display settings. Without that context, a technician can interpret automatic rescaling or a different diagnostic view as deterioration, recovery or a new target.
Check what the graph actually displays
Identify whether each trace is a raw echo profile, processed curve, threshold, suppression map or selected-target marker. The available views depend on the instrument and tool. Do not assume that two differently labelled lines represent independent physical reflections.
Compare the distance reference, units and displayed interval. If one image begins at the antenna and another excludes a near region, the same obstruction can appear in a different position on the screen. Keep a full-range record as well as any zoomed detail needed for diagnosis.
| Difference between records | Consequence for interpretation |
|---|---|
| Amplitude scale | Pixel height alone cannot establish whether the recorded signal increased or decreased. |
| Distance window | A target may be cropped out rather than physically absent. |
| Processing or gain | Displayed values may not be directly comparable; identify the documented diagnostic meaning. |
| Process state | A different level, filling route or surface condition may explain a genuinely different return. |
Use radar echo curve comparison with a known observation
Record an independently known level or a safely observed process change. Follow the candidate product return as the surface moves and compare fixed returns with the tank drawing. Similar peak height does not establish target identity, and movement alone is not enough when foam or another interface also moves.
When requesting support for METRAVON MV-RD12, first confirm which diagnostics the supplied version and tool can export. Do not specify a signal-margin unit, universal minimum peak height or undocumented tracking parameter solely from a screenshot of another instrument.
Preserve the record before changing suppression
Save the current configuration and available diagnostic files before an authorised change. Label before and after records with the action taken. If cleaning, aiming and mapping all change at once, an improvement may be real but its cause will remain uncertain.
To judge whether a suspected obstruction has disappeared, compare equivalent views under comparable conditions. To judge whether measurement recovered, also check the selected distance, validity and receiving-system value. A clean-looking graph does not prove that the PLC is using a fresh or correctly scaled observation.
Q1. Can two different radar models share one amplitude acceptance limit?
Only if their documented diagnostic quantities and the agreed test method make that comparison valid. Similar graph labels do not prove identical processing or scale.
Q2. Is a screenshot enough for remote support?
It can help if axes, units, selected distance and process state are visible. Add the original export when supported and identify any settings changed between captures.
Q3. Should the tallest fixed peak always be suppressed?
No. Identify the physical target and the valid measurement interval first. A poorly chosen map can suppress the surface when the level later enters that region.
Summary
Compare like with like before interpreting signal changes. Send labelled MV-RD12 traces, the tank section and a process timeline so the review can distinguish a changed target from a changed display.
